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Operating Manual
ACL Incorporated
1960 E. Devon Avenue, Elk Grove Village, IL 60007
ACL 800 MEGOHMMETER
NOTE: THIS MANUAL IS NOT TO BE
MKB June 18, 2008
OPERATION MANUAL
SEPARATED FROM METER!
847-981-9212
Page 1 of 12
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Summary of Contents for ACL 800
- Page 1 ACL Incorporated 1960 E. Devon Avenue, Elk Grove Village, IL 60007 847-981-9212 ACL 800 MEGOHMMETER OPERATION MANUAL NOTE: THIS MANUAL IS NOT TO BE SEPARATED FROM METER! MKB June 18, 2008 Page 1 of 12...
- Page 2 ACL Incorporated 1960 E. Devon Avenue, Elk Grove Village, IL 60007 847-981-9212 ACL 800 Megohmmeter The ACL 800 Megohmmeter kit measures surface resistivity, resistance, temperature and humidity. It is designed to test conductive, anti‐static, and static dissipative surfaces for electrical resistivity/resistance according to EOS/ESD, CECC, ANSI, ASTM and UL test procedures. The internal parallel electrodes comply with DIN EN 100 015/1 & ANSI/ESDA‐S11.11. The five pound electrodes can be externally connected for tests according to IEC 61340‐4‐1, ANSI/ESDA S4.1 & ANSI/ESDA S7.1. ACL 800 Megohmmeter Includes: Tester Two 5lb probes One ground cord Two accordion cables (stereo to banana) 110 power adapter* 9 volt battery Foam lined carrying case Certificate of calibration *ACL 800 Celsius models come equipped with 220v power adapter unless specified ACL 800 Optional Accessories Concentric Ring Probe Miniature Ring Probes Garment Clips for smocks Limits Resistivity: 10 ‐10 ohms/sq. ...
- Page 3 ACL Incorporated 1960 E. Devon Avenue, Elk Grove Village, IL 60007 847-981-9212 NTRODUCTION The ACL 800 Megohmmeter is a dependable and easy to use audit kit for conductive and dissipative surfaces. This meter is designed to be used in all facets of material production including engineering, maintenance, quality control, incoming inspection, manufacturing, research, or sales departments for the testing of anti‐static mats, floor finishes, paints, wrist straps, smocks, foot wear, bags and containers. When using the built‐in electrodes, the meter’s test values for surface resistivity are in ohms per square. When using the external five pound electrodes, the meter’s test values for resistance are in ohms (although they are displayed in ohms/sq.). ECADE CALE 3 = 1 kilohm 4 = 10 kilohms 5 = 100 kilohms 6 ...
- Page 4 ACL Incorporated 1960 E. Devon Avenue, Elk Grove Village, IL 60007 847-981-9212 NOTE ABOUT VOLTAGE In previous years, people desiring to measure resistivity or resistance followed the ASTM D264, ASTM 991, NFPA 56A or NFPA 99 test standards. These procedures required people to test at either 500 or 1000 volts. This caused concern regarding safety to the person doing the tests. The ESDA standardized the test procedures so that lower volts could be used at specific ranges. The ACL 800 meter uses a 9 volt battery. Some meters with 9 volts batteries do not give the accuracy that you need to perform the tests especially at values higher than 10 . The ACL 800 is built with a transformer that converts the 9 volt charge from the battery to 10 volts or 100 volts (whichever value is selected). The meter applies a constant charge over the complete voltage range. Accuracy is depends on applied voltage, temperature, and humidity. EMPERATURE AND UMIDITY The humidity and temperature affect the electrical properties of the material being tested. The combination of low humidity and low temperature will give the highest electrical resistance results or slowest dissipation times. At high humidity a thin layer of water is condensed or absorbed on or in the material being tested. This is true of hydroscopic additives that are added to a material to increase the electrical conductivity. These additives will allow moisture to be absorbable in the materials they are added to. At elevated temperatures the mobility of free electrons is increased thereby increasing the materials conductivity. This is especially true for carbon black, metallic oxides, metals, and other materials added to a material. When the material is at a lower temperature, built in stresses ...
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Page 5: Measuring With Internal Electrodes
ACL Incorporated 1960 E. Devon Avenue, Elk Grove Village, IL 60007 847-981-9212 EASURING WITH NTERNAL LECTRODES The parallel resistivity probe method, complies with EOS/ESD‐S11.11. It is used to give fast electrical resistivity measurements on flat homogeneous materials. It may be used on multilayered materials, but this should be noted along with the temperature and humidity value on the data report. When the measurement is taken between the tester’s two conductive rubber rails under the tester, the tester will indicate the surface resistivity of the material being tested. A. Prior to testing, make certain that surfaces to be tested are clean and free of contaminants. B. Allow the meter to equilibrate to the atmosphere the meter is to be used in. It may take a half hour for the meter to adjust to new environment conditions. C. Place the meter on the desired surface to be tested. D. Move switch to desired test voltage position, either 10 or 100 volts, depending on the target range of the material. ... - Page 6 ACL Incorporated 1960 E. Devon Avenue, Elk Grove Village, IL 60007 847-981-9212 By utilizing these probes to the ACL 800’s sockets it is possible to measure Point to Point (RTT) Resistance, Surface to Ground (RTG), and Volume Resistance. Using these probes will allow compliancy with various standards including ANSI/ESDA S4.1 for Worksurface – Resistance Measurements, ANSI/ESDA S7.1 Resistive Characterization of Materials – Floor Materials. When auditing is finished, unplug the cables and store probes in the protective case. If cables are left in the tester, the jacks will lose their elasticity as shown below: Jacks will “close” when cables are unplugged. ▲ ▲ Jacks will lose elasticity if left in the socket 12VDC If jacks are damaged or left in the open position, the internal probes will not engage when testing for surface resistivity. ...
- Page 7 ACL Incorporated 1960 E. Devon Avenue, Elk Grove Village, IL 60007 847-981-9212 B. Press the “TEST” button and the value will be displayed on the LCD. The meter will apply the correct voltage (10v or 100v) according to the value of what is measured. C. When performing test do not touch lead wires or probe. Avoid overlapping of lead wires. This will ensure accurate readings. N EXAMPLE OF MEASURING ON DISSIPATIVE FLOORING Taking routine measurements of tiles with dissipative floor finish will insure proper maintenance routines and will indicate any problems that may arise. Keeping a record of test results for temperature, humidity and electrical properties will provide a reference and will point toward a blueprint of traffic patterns on the floor. Good record keeping will insure success when developing and maintaining a maintenance program. To get an average measurement of a floor, map out a 4’ x 4’ section and conduct five tests (one at a time) within the square. Conduct a test for each side of the square and a final test diagonally through the center as shown in the drawing below. Each RTT test utilizes the 5 pound probes placed 3 feet apart (36 inches). Connect the test leads to the meter. Attach a 5 pound probe to the end of each lead and place 3 feet apart as indicated above. Press and hold the “TEST” button on the ACL 800 meter until a value is ...
- Page 8 ACL Incorporated 1960 E. Devon Avenue, Elk Grove Village, IL 60007 847-981-9212 (RTG) EASURING ESISTANCE TO ROUND Resistance to ground measurements can be used for the evaluation of floors, chairs, carts, work surfaces and other ESD controlled materials and products. Keeping a record of test results for temperature, humidity and electrical properties will provide a reference. : N EXAMPLE OF MEASURING ON DISSIPATIVE FLOORING For Testing Resistance on Floors, S7.1 requires a minimum of 5 RTG tests per 5,000 SqFt. Connect the leads for the external electrodes to the meter. ▲ ▲ ▲ ▲ When the cables have been plugged in 12VDC External Electrodes the appropriate socket, the parallel probes under the meter disengage.
- Page 9 ACL Incorporated 1960 E. Devon Avenue, Elk Grove Village, IL 60007 847-981-9212 : N EXAMPLE OF MEASURING ON DISSIPATIVE ABLE MATS A. To test RTG for a workstation, connect the first lead to the meter and to a 5 lb probe and put probe on work surface. Connect the 2 lead to the meter and to a groundable point (RTGP). Use the alligator clip if necessary. B. Press the “TEST” button and the value will be displayed on the LED. When performing test do not touch lead wires or probe. Avoid overlapping of lead wires. This will ensure accurate readings. C. Resistance values are in ohms. Record temperature, humidity and resistance. 6 If the range of your work surface is 10 to 10 , measure at 100v. The EOS standard says the 6 11 6 9 dissipative range is 10 – 10...
- Page 10 ACL Incorporated 1960 E. Devon Avenue, Elk Grove Village, IL 60007 847-981-9212 Volume Resistance Measurement M (RTG) EASURING ESISTANCE TO ROUND Volume Resistance measures the electrical path through a material. A. Connect one end of each of the banana test leads into the sockets of the meter. Connect the other end of the test coil cords into the 5 pound probes. B. Place sample material on a conductive metal plate (such as stainless steel). Place one of the 5 pound probes on the material so that the material is sandwiched between the probe and metal plate. (see below) C. Place the second 5 pound probe on the conductive metal plate. D. Press the “TEST” button and the value will be displayed on the LED. Volume Resistance is in ohms‐cm. ...
- Page 11 Press the power button and compare the resistor value, humidity, and temperature to the parameter to be calibrated. 10. Release the power button and slowly turn the correct adjustment pot. 11. Re‐press the power button, and observe the LCD screen. 12. Re‐press and adjust the pot if necessary. 13. Close case and tighten the 4 screws. 14. Press the power button to verify that the meter is working. ***Should calibration traceable to the NIST be required, please call ACL, Inc. directly to arrange for calibration. Specifications Accuracy for 10‐volt scale: –10 +/‐ 9% @ RH<90% –10 +/‐ 5% @ RH<90% –10 +/‐ 9% @ RH<90% ...
- Page 12 Two miniature conductive rubber external probes • One shielded BNC coaxial molded cable with gold center pin • Two female banana jacks to fit an ACL 800C meter • Made in USA • Will measure resistance of all small surfaces according to ESD S11.11 •...